import java.util.*;

/**
* This code is used in an agent based model of cops and robbers.

* It is a template for agents.

* Robbers will take gold from other robbers they meet, but also take it from the environment, 
* where there are piles of it (banks).

* Cops will take gold from robbers, and then arrest them, removing them from the 
* model.

* Note that the code is written to be as simple as possible for beginners to read, 
* rather than for efficiency and elegance. 

* @author <A href="http://www.geog.leeds.ac.uk/people/a.evans/">Andy Evans</A>
*/

public class Agent {

	// Variables storing agent knowledge and properties.
	
	// Spatial coodinates.
	int x = 0;
	int y = 0;
	
	int gold = 0;
	
	// Whether a cop or a robber.
	String name = "";
	
	// List of all the agents. 
	ArrayList <Agent> allAgents = null;
	
	// Environment so agents can check for banks.
	int[][] environment = null;
	int width = 0;
	int height = 0;
	
	// Whether this agent has been arrested.
	boolean toBeRemoved = false;
	
	
	void move () {
	
		// Move randomly up or down and left or right.
		if (Math.random() > 0.5) {
			x = x + 1;
		} else {
			x = x - 1;
		}
		
		if (Math.random() > 0.5) {
			y = y + 1; 
		} else { 
			y = y - 1;
		}
		
		
		// Boundary check: make sure we don't wander off the world.
		if (x < 0) x = 0;
		if (x >= width) x = width - 1;
		if (y < 0) y = 0;
		if (y >= height) y = height - 1;		
		
	}
	
	
	void act () {	
		
		// If this agent has been arrested already this round, skip this section.
		if (toBeRemoved == true) return;
		
		// If the current agent made from this template is a robber
		// and wasn't removed by the line above, check the current cell for gold.
		if (name.equals("robber")) {
			if (environment[x][y] > 0) {
				gold = gold + environment[x][y];
				environment[x][y] = 0;
			}
		}

		// When it acts, the agent based on this template will run through the list of 
		// all agents, acting on them.
		for (int agentNumber = 0; agentNumber < allAgents.size(); agentNumber = agentNumber + 1) {
		
			// Get the next agent in the list.
			Agent otherAgent = allAgents.get(agentNumber);
			
			// If the agent in the list is itself, skip this loop.
			if (otherAgent == this) continue;
		
			// If the agent from the list is in the same cell...
			if ((otherAgent.x == x) && (otherAgent.y == y)) {
			
				// If it is not a cop, take its gold 
				// (cops take gold from robbers, and robbers rob each other)
				if (otherAgent.name.equals("cop") == false) {
					gold = gold + otherAgent.gold;
					otherAgent.gold = 0;
				}
			
				// If the agent made from this template is a cop, and the agent 
				// from the list is a robber, set the robber as arrested.
				// The main Model code will later go through and remove these agents.
				if ((name.equals("cop")) && (otherAgent.name.equals("robber"))) {
					otherAgent.toBeRemoved = true;
				}
			
			}
			
		} 
	
	}
}